WYUTCOoOUUVII =T This question is pretty simple, we hope, if you look at things in the geovisualization environment. Fast Travel to 36.2001 (latitude) and -111.7540 (longitude). Your location is close to the edge of the game. The idea is that you have a nice "cross-section” 3D view of a river incising (downcutting) through the Paleozoic rock sequence. Even though this is the Little Colorado River -- we think this perspective is the easiest way for you to answer this question. QUESTION: As the river is starting to cut a canyon, what layer (sedimentary strata) does it first have to erode? What strata has been the last one to have been eroded? Reminder of names: The light blue colored Kaibab Limestone strata is at the top. The tan-colored Tapeats Sandstone is at the bottom. The bright yellow is the Coconino Sandstone. HINT #1: if you were going to saw through these rocks, which layer would you have to saw first? HINT #2: The sequence is the opposite of the age of the strata The river eroded the Tapeats sandstone first and the Kaibab Limestone last The river eroded the Coconino Sandstone first, then Tapeats, and Kaibab The river eroded the top (Kaibab Limestone) first and the bottom (Tapeats Sandstone last) | do not have sufficient information to answer this question.
